sp_MSsetgentozero (Transact-SQL MetaData) Definition

Please note: that the following source code is provided and copyrighted by Microsoft and is for educational purpose only.
The meta data is from an SQL 2012 Server.

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Definition:

sys.sp_MSsetgentozero(int @tablenick
, uniqueidentifier @rowguid
, tinyint @metatype)

MetaData:

 create procedure sys.sp_MSsetgentozero  
        (@tablenick int,   
         @rowguid uniqueidentifier,  
         @metatype tinyint= null)  
as  
    declare @retcode int  
    declare @METADATA_TYPE_Tombstone tinyint  
    declare @METADATA_TYPE_Contents tinyint  
    declare @METADATA_TYPE_PartialDelete tinyint  
    declare @METADATA_TYPE_SystemDelete tinyint  
  
    set @METADATA_TYPE_Tombstone= 1  
    set @METADATA_TYPE_Contents= 2  
    set @METADATA_TYPE_PartialDelete= 5  
    set @METADATA_TYPE_SystemDelete= 6  
      
    if (@rowguid is null)  
    begin  
        RAISERROR(14043, 16, -1, '@rowguid', 'sp_MSsetgentozero')  
        return (1)  
    end  
    if (@tablenick is null)  
    begin  
        RAISERROR(14043, 16, -1, '@tablenick', 'sp_MSsetgentozero')  
        return (1)  
    end  
    if (@metatype is not null and   
        @metatype not in (@METADATA_TYPE_Tombstone,  
                          @METADATA_TYPE_Contents,  
                          @METADATA_TYPE_PartialDelete,  
                          @METADATA_TYPE_SystemDelete))  
    begin  
        -- RAISERROR(20052, 16, -1)  
        return 0  
    end  
  
    --  security check  
    exec @retcode = sys.sp_MSrepl_PAL_rolecheck @tablenick = @tablenick  
    if (@retcode <> 0) or (@@error <> 0)  
        return 1  
  
    if @metatype in (@METADATA_TYPE_Tombstone,  
                     @METADATA_TYPE_PartialDelete,  
                     @METADATA_TYPE_SystemDelete)  
    begin  
                update dbo.MSmerge_tombstone   
                        set generation = 0  
                        where tablenick = @tablenick and rowguid = @rowguid  
    end  
    else if @metatype = @METADATA_TYPE_Contents  
    begin  
                update dbo.MSmerge_contents   
                        set generation = 0  
                        where tablenick = @tablenick and rowguid = @rowguid  
  
                update dbo.MSmerge_past_partition_mappings   
                        set generation = 0   
                        where tablenick = @tablenick and rowguid = @rowguid  
    end  
    else  
    begin  
                update dbo.MSmerge_tombstone   
                        set generation = 0  
                        where tablenick = @tablenick and rowguid = @rowguid  
  
                if 0 = @@rowcount  
                begin  
                        update dbo.MSmerge_contents   
                                set generation = 0  
                                where tablenick = @tablenick and rowguid = @rowguid  
                end  
          
        update dbo.MSmerge_past_partition_mappings   
            set generation = 0   
            where tablenick = @tablenick and rowguid = @rowguid  
    end  
  
    return 0